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If you can route a shorter belt and do away with the smog pump altogether I would go with that. Otherwise the pumps usually have the main housing with a cover plate bolted to it. You need to get access to the inside of the pump, remove the internals, so that it is not pumping all time.
A grinder pump will normally run for one or two minutes and automatically turn off when the tank is emptied. The pump is powered by electricity and is connected to a control panel near your electric meter.